Khan Academy: 2757 products
Khan Academy is an organization on a mission. We're a not-for-profit with the goal of changing education for the better by providing a free world-class education for anyone anywhere.
All of the site's resources are available to anyone. It doesn't matter if you are a student, teacher, home-schooler, principal, adult returning to the classroom after 20 years, or a friendly alien just trying to get …
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Biology: 2015 AP Biology free response 5
Phototropism investigation. Biology Life is beautiful! From atoms to cells, from genes to proteins, from populations to ecosystems, biology…
VideoFree7 minutes
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Cosmology and astronomy: Pangaea
Pangaea - the idea of Pangaea and some of the evidence behind it Cosmology and astronomy It's a great, big universe out there. In this sect…
VideoFree6 minutes
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Biology: Eukaryopolis - The city of animal cells
Hank tells us about the city of Eukaryopolis - the animal cell that is responsible for all the cool things that happen in our bodies. Biolo…
VideoFree11 minutes
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Biology: Hydrolysis
How hydrolysis can break down polysaccharides (carbohydrates) like starch, cellulose, chitin and glycogen. Biology Life is beautiful! From …
VideoFree8 minutes
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Biology: Conceptual overview of light dependent reactions
Seeing how light energy can excite electrons which can be used to create ATP and NADPH (with oxygen as a byproduct). Biology Life is beauti…
VideoFree9 minutes
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High school biology: DNA spells evolution
DNA weaves together the tapestry of life on Earth. It mutates, which can lead to variation among organisms. Watch how natural selection rel…
VideoFree2
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Biology: ATP hydrolysis mechanism
ATP hydrolysis mechanism. How energy is released when ATP is converted to ADP and phosphate. Biology Life is beautiful! From atoms to cells…
VideoFree4 minutes
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High school biology: Egg, sperm, and fertilization
High school biology The reproductive system Topic: Science Learn about all the sciences, from physics, chemistry and biology, to cosmology …
VideoFree12
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Biology: 2015 AP Biology free response, 1d-e
Light-dark activity cycle of mutant mice and evolutionary implications. Biology Life is beautiful! From atoms to cells, from genes to prote…
VideoFree7 minutes
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High school biology: LeBron Asks: What muscles do we use when shooting a basket?
LeBron James asks Sal Khan about which muscles we use when we shoot a basket. High school biology The musculoskeletal system Topic: Science…
VideoFree3
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Cosmology and astronomy: Apsidal precession (perihelion precession) and Milankovitch cycles
Apsidal Precession (Perihelion Precession) Cosmology and astronomy It's a great, big universe out there. In this section of Khan Academy, y…
VideoFree7 minutes
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Biology: Uniporters, symporters and antiporters
Uniporters, symporters, and antiporters are proteins that are used in transport of substances across a cell membrane. Uniporters are invo…
VideoFree7 minutes
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Biology: Beginnings of life
Life and photosynthesis start to thrive in the Archean Eon Biology Life is beautiful! From atoms to cells, from genes to proteins, from pop…
VideoFree10 minutes
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Biology: Predator-prey cycles
What effect do interactions between species have on the sizes of the populations involved? Learn about the dynamics of predator and prey po…
VideoFree5 minutes
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Cosmology and astronomy: Firestick farming in early Australia
How the indigenous Australians used fire to change their environment Cosmology and astronomy It's a great, big universe out there. In this …
VideoFree7 minutes